Lower pcc for addmm slightly

Author: kevinwuTT

tests/lowering/matmul/test_addmm.py

@@ -41,4 +41,4 @@ def test_addmm(device, input_shapes):
         if node.target == ttnn.matmul:
             assert node.meta["val"].size() == input_shapes[0]
     # Check inference result
-    assert_with_pcc(result_before, result_after)
+    assert_with_pcc(result_before, result_after, pcc=0.999)